The baseball diamond in Figure 4.32 is a square with sides 27.4 m (90 ft) long. If the positive x axis
points from home plate to first base and the positive
y axis points from home plate to third base, find the
magnitude and the direction angle of the displacement
vector of a base runner who has just hit (a) a double,
(b) a triple, and (c) a home run.

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.